#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{FILE*fp;
char str[100];
int i;
if((fp=fopen("a1","w"))==NULL)
{printf("can not open file\n");
exit(0);

}
printf("input a string:\n");
gets(str);
while(str[i]!='!')
{if(str[i]>='a'&&str[i]<='z')
    str[i]=str[i]-32;
    fputc(str[i],fp);
    i++;
    
}fclose(fp);
 fp=fopen("a1","r");
 fgets(str,strlen(str)+1,fp);
 printf("%s\n",str);
 fclose(fp);
 return 0;


}
